String with space taken from array isn't equal to another identical string taken from text by index

Question

I have the text and I have a variable with the current index of the current letter in this text. I also have an array that contains arrays with two elements:

1. String with character (It could be any letter including space) For example '1' or 'a' or ' '
2. HTML Element.
   

It looks like this:

const arr = `[['1', document.querySelector('.k-one')], ['a', document.querySelector('.k-a')], [' ', document.querySelector('.k-space')], and so on...]`

Then I need to get a subarray with the first element equals to text[currentIndex] (sting which contains letter)

So I use arr.find(array => array[0] == text[currentIndex]) and everything goes OK until text[currentIndex] isn't ' '
In this case I get an error, because arr.find(array => array[0] == text[currentIndex]) returns undefined because array[0] == text[currentIndex] returns false

but when I log array[0] and text[currentIndex] both of them returns a string with space like this ' '

**I don't understand what happens and what goes wrong.

How can two identical strings return false when I compare them**